Jamaica's Usain Bolt sprinted to a convincing victory in the men's Olympic 100 meters race to retain his gold medal, at the London Olympic Games last night.The world's fastest man and world record holder Bolt took 9.63 seconds to complete the race, setting a new Olympic record and clocking the second fastest time in history.His compatriot and training partner Yohan Blake was the second best. He equalled his personal best of 9.75 seconds to take the Silver. 2004 Olympic gold medallist American Justin Gatlin took the bronze medal.